.announcement {
  width: 960px;
  height: 25px;
  background: transparent;
  line-height: 25px;
  color: goldenrod;
}
.announcement-item {
  cursor: pointer;
}
.category {
  position: relative;
  list-style: none;
  font-size: 14px;
  color: white;
  padding:0px;
  margin: 0px;
}

.category:before {
  content: '课程分类';
  display: block;
  height: 27px;
  width: 100%;
  margin-bottom: 3px;
  font-size: 23px;
}

.category li {
  border: 1px solid white;
  padding-left: 10px;
  margin-bottom: 5px;
  background: black;
}

.category li:hover {
  background: lightgrey;
  border-color: black;
  color: darkgreen;
  border-left: 4px solid darkgreen;
}

.category li a {
  display: inline-block;
  height: 50px;
  line-height: 50px;
  cursor: pointer;
}


.recommend-priority {
  position: relative;
  margin-top: 15px;
  margin-bottom: 15px;
  min-height: 206px;
}

.recommend {
  border: 1px solid white;
  position: relative;
}

.recommend .recommend-item {
  margin-bottom: 10px;
  margin-top: 10px;
}

.recommend .recommend-item a {
  display: block;
  height: 168px;
  width: 140px;
  border: 2px solid white;
}

.recommend .recommend-item a:hover {
  border-color: darkgrey;
  transition: border .3s ease-in-out;
}

.recommend .recommend-item a:hover {
  cursor: pointer;
}

.recommend .recommend-item a img {
  height: 164px;
  width: 136px;

}
.detail {
  float: right;
  margin: 10px 10px 10px 0;
}
.detail a {
  display: block;
  width: 40px;
  height: 168px;
  line-height: 168px;
  font-size: 26px;
  text-align: center;
  color: white;

}
.detail a:hover {
  color: darkgreen;
  cursor: pointer;
  font-size: 40px;
}

.user-login {
  margin-top: 15px;
  font-size: 14px;
  color: black;
  border: 1px solid white;
}

.account-info, .password-info {
  margin: 10px 0px;
}

.user-login .text {
  height: 20px;
  line-height: 20px;
  text-align: right;
  color: white;
}

.user-login input {
  display: block;
  border: none;
  height: 20px;
  width: 140px;
  padding-left: 5px;
  font-size: 12px;
  color: darkgrey;
  box-sizing: border-box;
  outline: 0px;
}

.operation ul {
  list-style: none;
}

.operation ul li {
  float: right;
  margin-left: 10px;
}

.operation ul li a {
  display: block;
  cursor: pointer;
}

.operation .login-btn {
  margin-right: 10px;
  -webkit-transition: transform .3s ease-out;
  -moz-transition: transform .3s ease-out;
  -ms-transition: transform .3s ease-out;
  -o-transition: transform .3s ease-out;
  transition: transform .3s ease-out;
  color: white;
}

.operation .login-btn:hover {
  -webkit-transform: rotate(360deg);
  -moz-transform: rotate(360deg);
  -ms-transform: rotate(360deg);
  -o-transform: rotate(360deg);
  transform: rotate(360deg);
}

.operation .sign-in, .operation .forget {
  color: darkgrey;
  color: white;
}

.recommend-module {
  position: relative;
  margin-top: 96px;
  margin-bottom: 10px;
  border: 1px solid white;
  box-sizing: border-box;
  padding: 10px 0px;
}

.recommend-module a {
  display: block;
  width: 220px;
  height: 100px;
  border: 1px solid darkgrey;
  box-sizing: border-box;
}

.recommend-module a:hover {
  border-color: white;
}

.vedio {
  background: white;
  color: black;
  font-size: 12px;
}

.vedio-info {
  text-align: left;
}

.vedio-info span {
  margin-left: 10px;
}

.vedio-title {
  text-align: center;
}

.recommend-module1 {
  position: relative;
  margin-top: 96px;
  margin-bottom: 10px;
  border: 1px solid white;
  box-sizing: border-box;
  padding: 10px 0px;
}

.recommend-module1 a {
  display: block;
  width: 220px;
  height: 100px;
  border: 1px solid darkgrey;
  box-sizing: border-box;
}

.recommend-module1 a:hover {
  border-color: white;
}

.recommend-module2 {
  position: relative;
  margin-top: 96px;
  margin-bottom: 10px;
  border: 1px solid white;
  box-sizing: border-box;
  padding: 10px 0px;
}

.recommend-module2 a {
  display: block;
  width: 220px;
  height: 100px;
  border: 1px solid darkgrey;
  box-sizing: border-box;
}

.recommend-module2 a:hover {
  border-color: white;
}
